Laboratory Evaluation of Organophilic Phyllosilicate for Improving Sag Stability of Oil-based Drilling Fluid
Based on the fact that the organoclay organic modifier cation of oil-based drilling fluid is easy to decompose and desorption at high temperature,which leads to poor drilling fluid performance and sag of weight material,an organoclay(organophilic phyllosilicate)suitable for diesel-based drilling fluid system was synthesized by using magnesium chloride hexamethonium and cetyltrimethoxysilane as raw materials to improve the sag stability of oil-based drilling fluid.The structure was characterized and the properties were evaluated by Fourier infrared spectroscopy(FTIR),X-ray diffraction(XRD)and the settling stability test of drilling fluid.The results showed that the organosilicate material had a 2∶1 layered silicate structure and an asymmetric organic functional group structure connected by Si—C covalent bond,and there was no obvious thermal decomposition at 300℃.Compared with the commonly used oil-based drilling fluid in Daqing oilfield,the organophilic phyllosilicate improved the yield point,yield point to plastic viscosity ratio and storage modulus of the oil-based drilling fluid,and obviously improved the suspension property and sag stability of the oil-based drilling fluid with density range of 1.4～2.0 g·cm-3 and the aging temperature below 150℃.
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